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Abstract

Improved readability of low resolution character displays and printers is achieved by displaying or printing from a family of stored models from which the appearance of a word is derived. Character form and intercharacter spacing are defined by the models that consider various aspects such as adjacent characters, line leading and justification. The resulting patterns are functions of words, not of individual characters. A word model, any sequence of characters delimited by spaces, is subject to stress derived from the requirements of justification. Simple models that are a single image are invariant to justification and are transferred from storage in a single copy operation. Another model has linear springs between successive characters that permit certain character spacing to be either expanded or compressed.

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United States

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English (United States)

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Context-Dependent Character Image Formation

Improved readability of low resolution character displays and printers is
achieved by displaying or printing from a family of stored models from which the
appearance of a word is derived. Character form and intercharacter spacing are
defined by the models that consider various aspects such as adjacent
characters, line leading and justification. The resulting patterns are functions of
words, not of individual characters. A word model, any sequence of characters
delimited by spaces, is subject to stress derived from the requirements of
justification. Simple models that are a single image are invariant to justification
and are transferred from storage in a single copy operation. Another model has
linear springs between successive characters that permit certain character
spacing to be either expanded or compressed. Word models will thus vary.
They can be categorized as either "fixed image" or "parameterized-image" or
"procedural" models. With the fixed-image model, unvarying images of words are
stored and have the same appearance at each occurrence. Positional errors are
accommodated between words. Storage volume is large and word images are
stored in gray scale or "antialiased" form that permits perceptual spacing of
characters within a word to a small fraction of a pel (picture element). The
parameterized-image model uses an interpreter to synthesize the image from its
parameters and a data base of character images that a...